Two Good References
James Patterson,
For cheating specifically at blackjack, Bill Zender's How to Detect Casino Cheating at Blackjack is an excellent resource.
For cheating in general (including BJ), I highly recommend Casino Game Protection: A Comprehensive Guide by Steve Forte, who apparently knows a thing or two about the subject ;-)
Neither is available from bj21, but a quick search of Amazon showed both can be ordered: Zender's book starts at $8.70, and Forte's at $174.95 (it cost $200 new, which is what I paid for it).
Hope this helps!
Dog Hand